Reply to "Vintage racing brakes"

 

Brake info from FIA Homologation Paper

Stock Brakes	
Girling 4 Piston    		                        Front Brake		  Rear Brake	
                        Pistons / Wheel	                4		          1	
		        Outside Diameter of Piston 2x	42,85 mm   1,68 in	  42,8 mm	1,68 in
		        Outside Diameter of Piston 2x	33,96 mm   1,33 in		
		        Outside Diameter of Disc	282 mm	   11,10 in	  297 mm	11,7 in
		        Thickness of Disc	        20 mm	   0,79 in	  18,5 mm	0,73 in
		        Length of Pads	                93 mm	   3,63 in	  62 mm	        2,44 in
		        Width of Pads	                48 mm	   1,89 in	  48 mm	        1,89 in
		        Total Area of Pads / wheel	89 cm2	   13,8 sq. in	  59,4 mm	9,2 sq. In
							
------------------------------------------------------------------------------------------------------------	
GR4 Brakes					
Girling 4 Piston Apr-72		                        Front Brake		  Rear Brake					
  		        
                        Pistons / Wheel	                4	                  4	
		        Outside Diameter of Piston 4x	35 mm			  29,5 mm	
                        Outside Diameter of Disc	304 mm			  304 mm	
	                Thickness of Disc	        28 mm			  28 mm	
	                Length of Pads	                97 mm 		  	  97 mm	
		        Width of Pads	                49 mm			  49 mm	
		        Total Area of Pads / wheel	95 cm2			  95 cm2	

Front Caliper part no	31/32
Rear Caliper part no	33/34

------------------------------------------------------------------------------------------------------------
GR4 Brakes	      	
Lockheed 4 Piston Apr-74	                       Front Brake               Rear Brake
						
 		        Pistons / Wheel	               4			 4	
		        Outside Diameter of Piston 4x  44,5 mm	  1,75 in	 41,25 mm   1,625 in
	                Outside Diameter of Disc       304 mm	  11,97 in	 304 mm	    11,97 in
	                Thickness of Disc	       28 mm	  1,10 in	 28 mm	    1,10 in
		        Length of Pads	               130 mm	  5,12 in	 130 mm	    5,12 in
		        Width of Pads	               50 mm	  1,97 in	 50 mm	    1,97 in
		        Total Area of Pads / wheel     120,8 cm2  18,7 in	 120,8 cm2  18,7 in

Front Caliper part no   507.33.041/042							
Rear Caliper part no    507.33.043/044

------------------------------------------------------------------------------------------------------------
GR4 Brakes
Girling 3 Piston Jul-74	                                Front Brake		 Rear Brake

                        Pistons / Wheel	                3			 3
	                Outside Diameter of Piston 2x	42,5 mm	  1,68 in	 30 mm	    1,18 in
                        Outside Diameter of Piston 1x	60 mm	  2,36 in	 42,5 mm    1,68 in
	                Outside Diameter of Disc	288 mm	  11,35 in	 274,5 mm   10,8 in
	                Thickness of Disc	        31,75 mm  1,25 in	 20 mm	    0,79 in
		        Length of Pads	                114 mm	  4,5 in	 78 mm	    3,07 in
		        Width of Pads	                62 mm	  2,44 in	 45 mm	    1,77 in
		        Total Area of Pads / wheel	115 cm2	  17,825 sq. In	 64 cm2	    9,92 sq. in

Front Caliper part no   506.3.3.064/065
Rear Caliper part no    506.3.3.066/067
Brake Booster 	        506.4.2.007						
Master Cylinder	        506.4.2.008						
Adj valve	        503.3.3.119						
				
------------------------------------------------------------------------------------------------------------
GR3 Brakes			
Girling 3 Piston Jan-75	      		                
(From GR4 except rear disc)				
                                                        Front Brake		  Rear Brake
		        Pistons / Wheel	                3			  3	
		        Outside Diameter of Piston 2x	42,6 mm	  1,68 in	  30 mm	    1,18 in
		        Outside Diameter of Piston 1x	60 mm	  2,36 in	  42,5 mm   1,68 in
                        Outside Diameter of Disc	288 mm	  11,35 in	  297 mm    10,693 in
                        Thickness of Disc	        31,75 mm  1,25 in	  18,5 mm   0,728 in
		        Length of Pads	                114 mm	  4,5 in          78 mm	    3,07 in
		        Width of Pads	                62 mm	  2,44 in	  45 mm	    1,77 in
		        Total Area of Pads / wheel	115 cm2	  17,825 sq. In	  64 cm2    9,92 sq. in


Front Caliper part no   506.3.3.064/065
Rear Caliper part no    506.3.3.066/067
Brake Booster 	        506.4.2.007						
Master Cylinder	        506.4.2.008						
Adj valve	        503.3.3.119							
				
------------------------------------------------------------------------------------------------------------
GR4 Brakes
Lockheed 8 Piston Apr-75	      		        Front Brake			
							
                        Pistons / Wheel	                8				
 		        Outside Diameter of Piston 4x	28,575 mm   1 1/8 in		
                        Outside Diameter of Piston 4x	31,75 mm    1 1/4 in		
		        Outside Diameter of Disc	304 mm	    11,97 in		
		        Thickness of Disc	        28 mm	    1,10 in		
		        Length of Pads	                101,6 mm    4 in		
		        Width of Pads	                49,53 mm    1,95 in		
		        Total Area of Pads / wheel	214,4 cm2   33,23 sq. in		
		        Pads / Caliper	                4

Front Caliper part no   507.33.047/048			

------------------------------------------------------------------------------------------------------------